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Stock-Based Compensation - Summary of Stock-based Compensation by Income Statement Line Item (Details) - USD ($) | 3 Months Ended | 9 Months Ended
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Feb. 24, 2019 | Feb. 25, 2018 | Feb. 24, 2019 | Feb. 25, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation | $ 816,000 | $ 1,147,000 | $ 2,482,000 | $ 3,212,000
Cost of sales |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation | 116,000 | 137,000 | 334,000 | 398,000
Research and development |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation | 29,000 | 41,000 | 84,000 | 82,000
Selling, general and administrative |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation | 671,000 | 969,000 | 2,064,000 | 2,732,000
Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation | 245,000 | 380,000 | 689,000 | 1,057,000
RSUs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation | $ 571,000 | $ 767,000 | $ 1,793,000 | $ 2,155,000

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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